How many chill hours does 99777 get?

99777 averages 699 chill hours per winter, ranging from 531 to 1048 across the last 10 years.

What hardiness zone is 99777?

99777 is in USDA hardiness zone 1b.

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The short answer

99777 averages 699 chill hours per winter (531–1,048 across 10 years) in USDA zone 1b.

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 99777’s chill hours and zone:

Chill and zone requirements are comfortably met in 99777.

Show 6 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99777 get?: 99777 averages 699 chill hours per winter, ranging from 531 to 1048 across the last 10 years.
What hardiness zone is 99777?: 99777 is in USDA hardiness zone 1b.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026